staging:iio:adc: header cleanup - remove unused.

Clear out all the excessive includes in the *_ring.c files.
Mixture of cut and paste bloat and things needed for code that
has gone away.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
6 files changed